This is Aperture Harry Callaghan

[Turrets]
Cores and turrets of every stage
Wouldn't you like to escape this cage?

[Defective Turrets]
Come to us and you'll be sure
You're not safe in Aperture

[Turrets]
This is Aperture!
This is Aperture!
Test subjects die once they're in sight
This is Aperture!
Everybody hit the floor
Take a seat 'til the neurotoxin makes you die!

[Defective Turrets]
It's not safe! We are sure
You're not safe in Aperture

[Wheatley]
I am the one that's keeping you alive
Because, y'know, it's bloody hard to survive!

[GlaDOS]
I am the one that wants to test
Maybe at the end I'll let you rest!